Just in case, I personally address the issue by reversing the direction at the low level:
synclient | grep ScrollDelta Session and Startup > Application Autostart > Add synclient VertScrollDelta=-<formerValue> HorizScrollDelta=-<formerValue>
May cause other problems if you have advanced needs, e.g. w/ a graphics tablet, but it is a perfect solution for me.
Just in case, I personally address the issue by reversing the direction at the low level:
synclient | grep ScrollDelta =-<formerValue> HorizScrollDelt a=-<formerValue >
Session and Startup > Application Autostart > Add
synclient VertScrollDelta
May cause other problems if you have advanced needs, e.g. w/ a graphics tablet, but it is a perfect solution for me.